Consider the following processes involving free particles (i) \hat{n}\to \hat{p}+{e}^{+}+{\hat{v}}_{e} (ii) \hat{p}+n\to {\pi }^{- } (iii) p+n\to {\pi }^{+}+{\pi }^{0}+{\pi }^{0} (iv) p+{\hat{v}}_{e}\to n+{e}^{+} Which of the following statements is true?

Particle physics — CSIR Net PYQ (Question 1)

A Particle physics previous-year question (PYQ) from Nuclear and Particle Physics (CSIR Net). Read the question, check the correct answer, then practise the full topic.

Question 1 of 19 · 5.0 marks

Consider the following processes involving free particles
(i)

\overset{n}{^} \to \overset{p}{^} + e^{+} + \overset{v}{^}_{e}

(ii)

\overset{p}{^} + n \to π^{-}

(iii)

p + n \to π^{+} + π^{0} + π^{0}

(iv)

p + \overset{v}{^}_{e} \to n + e^{+}

Which of the following statements is true?

1Process (i) obeys all conservation laws
2Process (ii) conserves baryon number, but violates energy-momentum conservation
3process (iii) is not allowed by strong interaction but is allowed by weak interactions
4Process (iv) conserves baryon number, but violates lepton number conservation

Correct answer: Option 2

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